Beginner here. I know I must be doing something right... because DID get this much working:
1st slider... when moved... shows a value in a label #1.
2nd slider... when moved... shows a value in label #2.

But what would be the IBAction and IBOutlet syntax... if I tried to do this instead:
When either of the 2 sliders are moved... values for BOTH sliders are shown in label #1.
(Label #2 won't be needed at all.)

I keep getting compile-time errors like: "first use not defined" for the sliders.